build: publish gh pages (#170)

* build: add workflow to publish gh pages

* build: add workflow to publish gh pages

.github/workflows/publish.yml

@@ -0,0 +1,48 @@
+name: publish
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Archive artifact
+        shell: sh
+        run: |
+          echo ::group::Archive artifact
+          tar \
+            --dereference --hard-dereference \
+            --directory "docs" \
+            -cvf "$RUNNER_TEMP/artifact.tar" \
+            --exclude=.git \
+            --exclude=.github \
+            .
+          echo ::endgroup::
+      - uses: actions/upload-artifact@v4
+        with:
+          name: github-pages
+          path: ${{ runner.temp }}/artifact.tar
+          retention-days: 1
+          if-no-files-found: error
+
+  publish:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Deploy to GitHub Pages
+        uses: actions/deploy-pages@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}